Catalytic removal of diesel soot particulates over K and Mg substituted La1−xKxCo1−yMgyO3 perovskite oxides

Effect of Dopant Loading on the Structural and Catalytic Properties of Mn-Doped SrTiO3 Catalysts for Catalytic Soot Combustion

“…All T m data are shown in Table 3. The highest difference in T m , at approximately 26 • C, occurred between the Mn1 and Mn0 catalysts, and is similar to previous reports, where different doped perovskites were used [16,29,30]. In addition, the most effective catalyst tested in this study is that one doped with 1 wt % of Mn (Mn1), which lowered the catalytic combustion of soot to 591 • C. This result is comparable with different perovskites where the T m of soot combustion reached temperatures above 500 • C [9,22,31,32].…”

Surface versus bulk alkali promotion of cobalt-oxide catalyst in soot oxidation

“…The addition of alkali often leads to strong enhancement of their catalytic activity [6][7][8][9]. Likewise, alkali promotion of catalysts for soot oxidation is reported to have a strong effect as shown in [3,10,11,12,13,14,15]. It is worth mentioning that the alkali cations may be located on the surface of the oxide material or intercalated into its structure.…”

Efficient catalytic removal of diesel soot over Mg substituted K/La0.8Ce0.2CoO3 perovskites with large surface areas

“…As presented in Fig. 1(b), the (1 1 0) diffraction peak shifts to lower angle with the increasing amount of Mg-substitution, while the (1 1 0) diffraction peak shifts to higher angle after K + impregnation, indicating that both Mg 2+ and K + are partially incorporated into the perovskite-type structure of catalysts [9,20]. The intensity of the (1 1 0) diffraction peak of K/ LCCM-4(600) is also higher than that of K/LCCM-4(400), which shows that higher calcination temperature will facilitate the partial incorporation of K + into the perovskite structure to replace La 3+ .…”

“…However, excess doping amount of Ce would lead to distortion of the structure generating impurities phase, and restrain the increase of catalytic activity [8]. Low valence Mg 2+ doped LaCoO 3 can enhance the mobility of surface lattice oxygen, change the valence of Co and generate oxygen vacancies during the reaction [9,13]. Additionally, MgO can inhibit the sintering of the perovskite oxides.…”

“…The key challenge is to develop highly active catalysts that can oxidize soot efficiently. Recently, various kinds of catalysts, such as precious metals [3,4], alkali metal containing catalysts [5,6], mixed oxides [7] and perovskite-type oxides [8,9], have been developed for soot combustion. Among them, perovskite-type metal oxides have emerged as an important catalytic material because of their good redox properties, high http://dx.doi.org/10.1016/j.cej.2016.02.038 1385-8947/Ó 2016 Elsevier B.V. All rights reserved.…”